Dun Aengus - prehistoric fort at the edge of an 100 meter high cliff. The first construction goes back to 1100 BC; around 500 BC, the triple wall defenses were probably built along the western side of fort.
Newgrange’s immense round white stone walls topped by a grass dome is part of the vast Neolithic necropolis Brú na Bóinne (the Boyne Palace), Co. Meath, contains Ireland’s finest Stone Age passage tomb, predating Pyramids by some six centuries.
Jarlshof is the best known prehistoric archaeological site in Shetland, Scotland. - Described as "one of the most Remarkable Archaeological Sites ever excavated in the British Isles", it contains Remains dating from 2500 BC up to the century AD.
I've always wanted to go to Ireland. I've had quite a few friends who have been, and they always come back so excited about it. Plus I love an Irish accent :) Maybe London to Ireland. so much potential for this trip.